MEASUREMENT OF LOSSES IN DIRECT TORQUE CONTROLLED PERMANENT MAGNET SYNCHRONOUS MOTOR BY ANALYSIS AND EXPERIMENTAL SETUP

A N Gokulprakash, A Sivaprakasam, T Manigandan

Abstract: Direct Torque Control (DTC) appears as an effective and practical control scheme for AC motor drives. The DTC of Permanent Magnet Synchronous Motors (PMSM) Drives attracted great attention, due to many features like high efficiency, quick dynamic performance and provide excellent steady state response. The adjustable speed drives are rapidly introduced in the area of electric vehicle and motion control devices and these devices are often powered by a battery source. Due to the restriction in energy supply, the improvement of motor efficiency is the most important priority, and hence the DTC technique is used to measure the losses in PMSM. In order to measure the losses, the offline and online calculation methods are proposed. In this work, the mechanical losses is depends on rotor speed and friction torque, and it is often uncontrollable but the electrical losses are controllable and hence the electrical losses can be measured certainly. The Offline control method is used for optimizing the steady-state efficiency of PMSM under DTC. In this proposed work, the losses are calculated by offline method for simulation and experimental setup in order to obtain the better steady state efficiency, and also comparatively investigated with analysis and experimental results

Keywords: Permanent Magnet Synchronous Motors, Direct Torque Control and Electrical Losses

DOI: https://doi.org/10.15623/ijret.2014.0319015